Fish tank



FIG. 1 is a front view of a fish tank showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof with the cap removed and the air seal inverted;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a front view thereof with the cap and air seal removed;

FIG. 8 is a top view of FIG. 7;

FIG. 9 is a front view of a fish tank with the cap removed.

FIG. 10 is a top view of FIG. 9; and,

FIG. 11 is a front view thereof with the cap, air, seal and collar removed. 

The ornamental design for a fish tank, as shown and described. 